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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
//===- PruneUnprofitable.cpp ----------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Mark a SCoP as unfeasible if not deemed profitable to optimize.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/PruneUnprofitable.h"
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#include "polly/ScopDetection.h"
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#include "polly/ScopInfo.h"
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#include "polly/ScopPass.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/IR/DebugLoc.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace polly;
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#define DEBUG_TYPE "polly-prune-unprofitable"
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namespace {
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STATISTIC(ScopsProcessed,
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"Number of SCoPs considered for unprofitability pruning");
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STATISTIC(ScopsPruned, "Number of pruned SCoPs because it they cannot be "
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"optimized in a significant way");
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STATISTIC(ScopsSurvived, "Number of SCoPs after pruning");
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STATISTIC(NumPrunedLoops, "Number of pruned loops");
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STATISTIC(NumPrunedBoxedLoops, "Number of pruned boxed loops");
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STATISTIC(NumPrunedAffineLoops, "Number of pruned affine loops");
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STATISTIC(NumLoopsInScop, "Number of loops in scops after pruning");
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STATISTIC(NumBoxedLoops, "Number of boxed loops in SCoPs after pruning");
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STATISTIC(NumAffineLoops, "Number of affine loops in SCoPs after pruning");
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class PruneUnprofitable : public ScopPass {
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private:
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void updateStatistics(Scop &S, bool Pruned) {
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auto ScopStats = S.getStatistics();
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if (Pruned) {
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ScopsPruned++;
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NumPrunedLoops += ScopStats.NumAffineLoops + ScopStats.NumBoxedLoops;
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NumPrunedBoxedLoops += ScopStats.NumBoxedLoops;
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NumPrunedAffineLoops += ScopStats.NumAffineLoops;
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} else {
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ScopsSurvived++;
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NumLoopsInScop += ScopStats.NumAffineLoops + ScopStats.NumBoxedLoops;
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NumBoxedLoops += ScopStats.NumBoxedLoops;
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NumAffineLoops += ScopStats.NumAffineLoops;
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}
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}
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public:
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static char ID;
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explicit PruneUnprofitable() : ScopPass(ID) {}
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PruneUnprofitable(const PruneUnprofitable &) = delete;
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PruneUnprofitable &operator=(const PruneUnprofitable &) = delete;
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<ScopInfoRegionPass>();
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AU.setPreservesAll();
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}
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bool runOnScop(Scop &S) override {
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if (PollyProcessUnprofitable) {
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LLVM_DEBUG(
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dbgs() << "NOTE: -polly-process-unprofitable active, won't prune "
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"anything\n");
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return false;
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}
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ScopsProcessed++;
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if (!S.isProfitable(true)) {
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LLVM_DEBUG(
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dbgs() << "SCoP pruned because it probably cannot be optimized in "
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"a significant way\n");
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S.invalidate(PROFITABLE, DebugLoc());
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updateStatistics(S, true);
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} else {
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updateStatistics(S, false);
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}
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return false;
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}
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};
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} // namespace
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char PruneUnprofitable::ID;
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Pass *polly::createPruneUnprofitablePass() { return new PruneUnprofitable(); }
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INITIALIZE_PASS_BEGIN(PruneUnprofitable, "polly-prune-unprofitable",
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"Polly - Prune unprofitable SCoPs", false, false)
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INITIALIZE_PASS_END(PruneUnprofitable, "polly-prune-unprofitable",
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"Polly - Prune unprofitable SCoPs", false, false)
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